Hi guys. this is the problem i faced yesterday. on red light. my idle would go down to 200-150 rpm and then it would come back to 800. then it will go again to 150, and then back to 800. sometimes it won't do it at all. Now sometimes the idle would be fine like around 800 but sometimes it drops to 400. what could be the problem? if i give my car for tuning and cleaning. would it fix it?